QRM
Recognised text
Text below was produced by optical character recognition and may contain errors. Check it against the original.
R,TRT
Bulletin issued by the Northern P.0O. Box 1010
Branches of the Wireless Institute Launceston
of Australia, Tasmanian Division. Tas. 7250
March 1978
Vol.7 No.l1l0
Registered for posting as
a publication Price 40¢
Category B.
There seems to be a feeling among some of our members
that ORM will improve if I have no part in it. As I have always
worked towards the betterment of ORM and the Branch, it would be
against those principles to stand in the way of any improvement
and therefore will not seek re-election as Editor.
I would like to thank the members who have supported
me and ORM with notes, articles and the general production of our
newsletter. In particular I thank Joe Richter, who is not a
member, who generously gave his time every month to print QORM
for us.
John VK7JV
Editor
MEETINGS
Mar. 10 Northern Branch Annual General meeting.
Clubrooms 34 Burke St. 8 p.m.
Mar. 14 North West Branch, Lakins Hall Ulverstone 8 p.m.
Mar. 18 Annual General meeting W.I.A. Tas. Div. 3 p.m.
Northern Clubrooms 34 Burke St.
Dinner at Kings Meadows Hotel 7.30 p.m.
Mar. 12 Mini Hamfest at back of QTH of VK7ZBY,Launceston Airport
{ i-
Page 2 ORM March 1978
We regret that we are once more unable to present the Northern
and North Western Branch notes as they have not been received
at this time.
NORTHERN BRANCH PRESIDENT's REPORT
as presented at the February meeting
During the year the Branch made some progress in the long line
of things yet to be achieved. Club Rooms of a more permanent
nature are now a reality and are slowly but surely being
organized into something all members will receive much enjoyment
from. AOCP and Novice classes have been to the fore this year
with excellent results being achieved. Activity in HF and VHF
has increased not only from our members but throughout the
State. This is evidenced by the large increase in outgoing and
incoming QSL cards.
At the January Branch meeting, section 14 of our By-Laws were
brought into line with section 98 of the Divisions Articles of
Association which states " Each Institute Branch shall elect
from amongst its members a Branch Prasident and a Branch
Vice-President, a Branch Treasurer and a Branch Secretary, who
shall constitute a committee to govern the Branch. The Branch
President shall also be a Vice-President of the Institute'.
As in most cases improvements are made and based on past
experience. During the last executive meeting it was discussed
and to start off the new term of office bearers, the following
positions are recommended for election:
EXECUTIVE
President
Vice-President (who would be the Equipment
Store Manager)
Treasurer
Secretary
OFFICE BEARERS
QSL Officer
Lecture Officer
Publicity Officer
WICEN
Educational and Librarian
QRM Editor
ORM Technical Editor
Club Room Manager
Broadcast Officer
Refreshments Officer
The reason for some of the changes are that the Vice-President
who doesn't normally have much to do could take over the job
of Equipment Store Manager. The fact that the present Executive
open up the club rooms for the store and it is assumed that this
system will continue, gives we feel a closer liason to the
operation of the store and the other point is that the store is
fast becoming the main stay of the Branch.
March 1978 QR M Page 3
With regard to QRM, under the new set-up where all WIA members
in the Post Code areas 7212 - 7304 are members of the Northern
Branch and will automatically receive OQRM, the need for a QRM
committee is now required. That is why we strongly recommend
the position of Editor and Technical Editor, with the added
recommendation that the Editor co-op two other members to
assist. We also suggest that the North West Branch be sked to
provide a Sub-Editor and a Technical Editor.
The other major change is the recommended apointment of a Club
Room Manager who would be responsible for the over-all operation
of the Club Rooms.
To help those who would like to take on some position but feel
they wouldn't know what to do, the present Executive will
prepare a set of guide lines on each position which will be
presented as soon as possible for ratification and use by
members.
Some members have indicated their willingness to stand for
positions and for your information they are:
Vice-President Joe VK7JG
Treasurer Tony VK7TP
e
ORM Editor Mac VK7CCC
Education & Librarian Brian VK7ZBY
Broadcast Officer Brian VK7ZBY
It is anticipated that the following will stand again:
QSL Officer Col VK7LZ
Lecture Officer Wal VK7ZWX
Publicity John VK7NJD
I do not intend to stand for any position this term but will
give any assistance I can to any member in any position.
As Bill Tanner VK7TE has been one of the stalwarts in getting
the Club Rooms and presently a member of the Club Room
Committee, I will be putting Bill's name forward as Club Room
Manager and hope he will accept.
I want to thank all members for their co-operation during the
year, especially those in positions who worked so hard for
the betterment of the Branch and Hobby. It has been a most
interesting and rewarding year.
And finally I would like to say that your executive and
Officers are there to try and help you and the cause of
Amateur Radio so when they ask for your assistance dont
hesitate.
Very 73
(v<é{zfi44»&~uo-
H.E. Hewens VK7HE
President
Northern Branch 1977/78
Page 4 ORM March 1978
DX notes by Col VKT7LZ.
For the average DXer the most exciting news would be
the possibility that Clipperton Island is to be re-activated
and as the last time this Island was on the Ham bands was in
August 1958 there is certainly going to be a heck of a line-up
waiting for business to commence. The story going around is that
a group of 8 French operators and HB9MX will make up the party
and operation is due to commence on the 20th March for 7 days,
usual DXpedition frequencies will be used and QSL's are via
F6BFH, thats the story for what its worth but if you are
wanting Clipperton Island keep it in mind.
Although its only South West Africa, sometimes called
Namibia its scarce enough for a mention. ZS3WBC will be busy
there from the lst to the 7th of March, QSL's to Box 1234
Walvis Bay.
ts been mentioned that UK1KAA is operating from
Franz Joseph Land but his QTH was Leningrad so I dont know,
best QSO him and find out.
For those lacking Syria keep a lookout for OE6DK/YK.
Horst is a member of the Peace keeping forces on the Syrian
side of the Gollan Hights and comes up occasionally on 14 MHz
SSB, at the time of writing this part of the world was coming
through long path from 0500%Z.
Although what happened a month ago doesn't do much
for anyone, here is a list of stations logged at this QTH
(bearing in mind that several didn't get listed).
3.5 MHZ, CW - KX6DC, UL7GW, W, VE and JA.
SSB - KG6RT, W and JA.
"
I only listened on this band around 1000 to 11002
on a couple of occasions.
7 MHz, CW - EI3CT, FM@COO, N4ZC/Kure Isl., KV4CI, W@NCA/HC1,
VP2MUZ, KH6, W, VE and many Europeans.
SSB - CE@AE, N4ZC/Kure Isl. GW3AX, GW4NZ, XEI1EL,
DL, G, and JA.
All stations were heard between 0800 and 0930Z so
there is plenty of scope here for listenars who
want to burn the midnight oil.
14 MHz, CW - You'll have to ask Snowy VK7CH what happened
here, all I QSO'ed was HS5FXT, ZB2AV.
SSB - Europe, EAG6EW, GI4GPC, GI4EPK, HB@LL, LX2LX,
OY3H, MID, 9HI1FF. and most European countries
are easily workable.
Africa, CN8CX, EA80Z, H5COA, HSFXT, ZET7AV
ZE7JR, ZS2AF, ZS20M, ZS10U, ZS5KI, VE7CQX/SU
9J2GJ, 9L1CA.
South America, VP8PT, HF@POL, 8R1Q and the usual
run of OA, HC, HK, CP, CE, LU, VYV, and ZP stations.
North America, this area was wide open most nights
local time with, FG, FM, FS, J3, KP4, TI, HI, VP2
XE, 8P6 all for the asking.
Asia, CR8, JY, OE6DK/YK, U0O5, UM@, UL7, VS6,
4X4, 9K2DX, 9M6, 9V1 were all logged.
March 1978 QR M Page 5
21 Miz, JA's seem to be audible most of the time, both on
SSb and CW. W's come through from 2300 to 0100Z.
KZ5BA was S9 from 0300 to 0500Z on the 18th of
et
February. Europeans were copied at 1200Z one night.
The Kure Island DXpedition was heard on SSB on
several occasions.
28 MHz, WABVOJ/Kure, WBBKLN/Kure, KG6, KH6, VE, VK, JA, W,
ZL, P29 were the last I could deo, all heard in the
mornings our local time.
For those interested in CW contests the 1978
Commonwealth contest commences at 1200Z on the 11th of March
and finishes at 1200Z on the 12th. All bands 3.5 to 28 MHz,
using the first 30 kHz of each band. Its open to every country
in the Brittish Commonwealth and each area in VE, VK and ZL
counts seperate.
QSL INFO
CSAAC P.O. Box 227 Banjui, Gambia.
C5AAP A.M. Pomfret, C/o Brittish High Commission
P.0. Box 507 Banjui, Gambia.
FG7AN wvia VE3FXT KH6JFI and WABVDJ via WAG6PYN
OE6DK/YK wvia OE6DK OY3H wvia W3HNK
P29AC wvia F6CYL P29BB via VK2BAX
VP2MBB, VP2MDH, VP2MUZ via WBSMDH
9K?2DX wvia We6LV
BV2B P.O. Box 101 Taipei, Taiwan.
Late news
The operators in the Clipperton Island Dxpedition due to
commence on the 24th of March are;
FOgXA (F9JS), FOPXB (F5II), FO@XC (F6BFH), FO@XD (F6ARC),
FO@XE (F9IE), FOUXF (F6AKO), FO@gXG (HBSAHL), FO@XH (HBOAEE)
.
Mellish Reef, VK2BJL is hoping to take a trip there in July,
VHF notes by Joe VK7JG.
6_metres has been very quiet with my last opening on 30th Jan.
with VK4ZRF. Previous to this it was open to ZL on 22nd Jan.
when 3 ZL's were worked as well as Eric VK5LP.
Over the past several years I have noticed that when
6 metres is open to ZL you can usually also work into VK5,
Dont forget that the equinox is approaching and we
could get some T.E.P. openings to the Northern Hemisphere.
2 metres has been just the opposite with the band being open
continuously for the past 5 days (16 to 20th Feb.), the
Geelong repeater VK3RML could be worked mobile from almost
anywhere in Launceston and from home the N.W. repeater was
workable for the first time. At the bottom end of the band
Kevin VK7ZAH and Daniel VK7DA have been active and on the 16th
a VK6 was heard, Kevin called him but conditions did not last
long enough to have a contact. 73 Joe
Page 6 QR M March 1978
VK7 W.I.A. QSL BUREAU
This is intended as a guide should you wish to use
the services of the Wireless Institute of Australia QSL Bureau.
When having QOSL cards printed do not choose a heavy-
weight type of card and make sure they are no larger than
54"x 3%". Outward cards larger than this can not be accepted
in future. There are two reasons for this request, firstly,
the postage depends on the weight and with the present high
postage rates we have to watch this carefully. We can send
70 normal cards for the same cost as only 50/60 oversized or
overweightones. Secondly, a big card will not fit in a normal
sized envelope which means special envelopes which cost more,
and they do not pack easily in bulk with other cards which
will probably result in damage to the card.
There is no charge for inward cards but outwards
are 2¢ each (non-members 5¢). This covers cost of postage,
envelopes, P.C. Box rental and other incidental expenses.
Please sort your cards alphabetically into prefixes
(Australia and U.S.A. into call areas). Writing the call sign
on the back of the card and enclosing a slip showing the
number of cards (if there are many) will help to make the job
a bit easier.
A number of DX stations have QSL managers these
days, so 1if you are given any special instructions at the
time of the QSO, always show this on the back of the card,
viz. "CT2BS wvia WA4CAD". I will then know to send it to
the WA4 bureau. Unless it is sent as directed it is doubtful
whether you would get a reply.
Inward cards for the North and North West Branches
are sent to VK7LZ and VK7MZ respectively shortly before their
monthly meeting dates and may be collected there. Cards for
members in the South are taken along to the meetings. If you
do not attend any of these meetings please try and arrange for
some one to collect them for you. Let me know if you do not
want your cards and they can be destroyed.
Current Call Books are held at the Bureau and the
full QTH of any station may be obtained from me.
The Bureau address is, G.P.0O. Box 371 D, Hobart 7001.
but I would prefer that cards, enquiries etc. be sent to my
home address, 95 Wentworth St., Bellerive 7018, Phone 44 2854.
Chas. Harrisson VK7CH
QSL Manager
FOR SALE
SE 501, 27 MHz SSB transceiver modified for use as a 2 metre
transverter driver. Supplied with 2 crystals, one to cover
144 - 144.2 and the other 145.8 -~ 146 MHz
Joe Gelston 40 Lavender Gr. Phone 443382
March 1978 QR M Page 7
IDENTIFY YOURSELF
At the Advisory Council meeting, held on Saturday
25th of February, reports indicated that the operating
standards of amateurs have degraded to a point where it is
now common to hear a QSO without any form of identification
and quite a few with insufficient identification. This is
particularly noticeable on the VHF FM channels.
Please do not follow bad examples and remember to
identify yourself at the beginning and end of a QSO as well
as every 5 minutes.
John VK7JV , Frank VK7BC
Official Observers
It seems Brian VK7ZBY has a drink problem. When out sailing
with Mike VK7FB, Brian fell in it, the drink that is. It
must have been a big glass Brian.
The WIA Broadcast on the 19th February was heard far and
wide, a inversion to VK3 gave them a good copy on our
Broadcast and quite a few called in for the call-back.
I believe that sometime in March Chris VK7UX will be here
for a holiday from Botswana, if so that will be the time
to organize a sked for that country.
Most peculiar are the sounds emanating from the phone when
you dial 445000, sounded like SSB to me.
Merv VK7NMP has his tower in a erect position and a three
element tri-band beam gracing the skyline of Invermay.
HARVEY K. SKEGG
(local Tasmanian VICOM agent)
for all AMATEUR RADIO EQUIPMENT
Opening Specials.
TS 8208 - $1085 FRG 7 - $330
TS 5208 - $ 690 SSR-1 < 5265
FT 101E - $ 845 TH3-Jr - $195
IC 228 - 8270 Ringo ARX-?2 - $ 48
IC 502 - $ 210 1 KW, Filter - $ 33
IC 202 - § 210 6JS6 - $ 12
Conditions of Sale.
1) freight charges not included in price.
2) transmitters disabled for non licence holders.
3) be early, we only have a limited stock.
4) orders may be placed by phone. - 436337
(002)
5) a deposit will be required.
dARVEY K. SKEGG, 280 East Derwent Hgw, Geilston Bay.
Page 8 QR M - March 1978
5 AMP REGULATED POWER SUPPLY, VARIABLE FROM 6 - 16 VOLT.
This circuit first appeared in QRM in October 1974 and as
I am often asked for a photo copy it was thought a good idea
to print the circuit. The original design is by John Reynolds
VK3ZMU, the overload protection circuit was modified by
John VK7JV.
Sy
va/ nos
'
!
'
'
+
'
.
'
'
‘
'
.
'
'
'
'
'
'
'
t
'
'
'
.
.
!
!
'
'
1
v
'
'
'
.
'
'
'
'
'
'
'
'
'
.
'
1
.
.
March 1978 QR M Page 9
Co?PER Siba
ComMmPendnNTr Sibé
page 10 QR M March 1978
HF - VHF DIP OSCILLATOR
Reprinted from Eastern Zone News. by Ray Price VK3AWQ
The writer had on many occasions, built up GDO's
from circuits out of various magazines, only to £ind them
either not oscillating at VHF frequencies or so full of
false dips that they were virtually unusable,
The following circuit is of one that seems to
behave itself on all frequencies, its not an original
eireuit, rather a modification of ether circuits, but it
works well for me. Let's hope it does the same for you.
bl « mny Diooé Tmar Welks
S) <« env-oFF Swirewm
9V
I used an OC1l71 transistor because it was in the
junk box, a AF1l4, 5, 6 should do just as well. The coils are
eut and try, depending on the former and wire size. I used
%" o0.d. formers out of an old transceiver, but hypodermic
syringe bodies make beaut formers.
The 144 Mdz coil is 2 turns wound on a 5/16 drill
shank with legs 1%" long. The 72 MHz coil is 3 turns on a
7/16" drill shank with legs 1%" long. 18g wire was used.
For the HF coils , wind about 15 turns on a %" o.d. former
with 26g wire and listen on your general coverage receiver.
Onece this coil is calibrated the rest is easy, either more
or less turns depending on the coverage required.
A VU meter was used, obtained from a place in
Little Lonsdale St. for $1.50.
Well hop to it and see if this gadget works as well
for you as it does for me. Dont forget to keep all leads
ghert. '
March 1978 QR M Page 11
IRON POWDER TOROIDAL CORES
Q
Q—CURVES Revision A
The following Q-curves will serve as a guide in the selection of R.F. Toroid Cores for your
application. Performance extracts are typical of a wide variety of cores in our supply.
W
._
MIX - 41 , MIX - 6
Green — 'HR’ | Yellow — 'SF’
80
,M_T, _"__T_
Premeability — 75 | Permeability — 8
g
%
Frequency KHz '
Frequency NHz
L10O=-Kiiz 20 40 60 180 100 200
- 200 MIX -3 .2 MIX
—10
ray — ‘HP' 8 Black —'W
Ay
f-1e0 106-3 100~t o0 Qray .
i T- 350 © up
Permeability — 30 ‘o Permeability — 6
%.
160
100-t #2g
T
[-94-3
e
T 76 uh,
140 ) 4=t #2053 o
)3 100=t #28 180, uh
1-80=
120 #30 195. uh
W .38 uh. |
IS T-587 rast #20
-
{— 100 — Tou~t 432 175. uh
1T-50- H5-10 7-t oz 22
| #33 110. uh. 1-25 T
0 1 -
[ W
1-37= 426 .42 uh.
414 100. uh
T-25"
10-t #29
10
2220 215 un,
[ Frequency hiiz.
200 kHz . 400 600 800 l..\lc' 30. | 40 | 50 60
{
MIX - 2 MIX — 12
#28 84. uh Red — ‘E’ Gr. & Wh. — "IRN-8’
250 100-t
5 ’ Permeability — 10 170 8-t #20 <14 uh. Permeability — 3.5
{ QA==
et
1-30-12
140
9=t w24 .13 uh,
T-25-12
120
212 9=t #:9 <09 up,
1/-;/"—’__‘\
—|
100 /‘; +28 «04 uh.
T-12-32
Frequency MHz
.
t Frequency MHz
{ 1. 2, 4 . 8 10 12 14 70 80
Page 12 QR M March 1978
POT CORES
MANGANESE-ZINC #77 FERRITE MATERIAL ¢
The POT CORE is an excellent choice of coil form when a great deal of inductarice is needed
using a very minimum amount of space. An inductance up into the Henries can be achieved using
a POT CORE of considerably less than one inch in diameter. They are used extensively for filter
work in the audio and kilohertz region, although they have many other applications ranging into
the megahertz frequencies, such as small signal transformers, pulse and broadband transformers,
as well as in tuned circuits of all descriptions.
The winding procedure is fast and simple. The coil is wound on a seperate nylon bobbin (which
is supplied) and is then inserted inside the POT CORE. Since the coil is encapsulated, it will be
completely shielded and will be absolutely free of any stray coupling or interference from adjacent
circuitry. Very close tolorances can be obtained to achieve a target performance which will re-
quire little or no trimming. Excellent 'Q' and stability can be expected.
We are now able to offer this item to the radio amateur in smali quantities. Four sizes in the
77 material are currently available. Other sizes and materials may be offered at a later date.
The POT CORE assembly is supplied complete with the two core-halves, a nylon bobbin and a
nylon mounting bolt including nut and washer. Use the formula and the 'turns vs. wire-size' chart
below to select the proper size core for your application
Turns = 100 desired L (mh MAXIMUM TURNS:
atHine
BO.
sl e o B ESIEE MAGNETIC PROPERTIES of #77 MATERIAL
AL (mh/100f) | 1 1 | it sem s iy 01 -
Initial permeability (Ua) = 130
1800rypical
Curie temperature 1) = 200° C
Saturation flux density (Bg) = 4600 gauss @ 10 Oer.
Amplitude permeability
4500 @ 2000 gauss, room temperature
7000 @ 1000 gauss, 125° C
5 2 : Core losses: 12 mw/cm® @ 1000 gauss, 10 KHz.
D |fe—E—]
S
| _ | L
[ [ T /| f
1 e Lx{)ect2p% to| 40% fewer |
1 I/ tujns when I?ND Wwound | |
depending on éveness and |
_tightness of wind s
L
| i
WIRE SIZE ! |
26 28 30 32 34 38 38 40 42 44 46 48 l“‘F"'
DIMENSIONS and PROPERTIES
physical magnet1c
r S I - B T value
Part No. C D E F A,(cm)? LL(mh/lom)
j
in, . 465 . 232 | 122 164 N . 114 . |
PC-1408-T1 \m (11.81)| (5.89) | (3.10) | (4.17) | (2.90) (.255) 19.6
in, LT .364 | 179 . 264 . 185 . 36.9
PC-2213-7T * (18.21)| (6.25) | ((4.55) | (6.71) | (4.70) (. 650) 1 3|| =
| in, 1.004 .851 .456 ,218 ’ .317 221 | | |
PC-3618&-1T . | (25,50 (11.58) | (5.54) | (8.05) | (5.61) | Lose) | 470
=
in,
.
1.181 | 1.000 .523
=
| 218 370 | .260 |
PC-3018-11 0 | (30.00)| (25.40) | (13.28) | (6.54) | (5.40) | (6.60) JL45 | e 29.0
Ag = Effective magnetic cross-sectional area, Ie = Effectlve magnetlc path Iength ‘Q
March 1978 Q R M Page 13
FERRITE BEADS
1 Ferrite-Beads are little dowel-like devices made from ferrite materials of various magnetic properties. They are
electrically equivalent to a tiny RF choke when slipped over an electrical conductor or a component lead. They
offer a simple, convenient, inexpensive and yet a very effective method of RF-shielding, RF-decoupling and
parasitic suppression.
High frequency noise is apt to be generated in various parts of any high frequency circuit and most common
suspects are power supply leads, ground connections and inter-stage connections. Also, conductors adjacent to the
chassis, to each other, and to other components offer a convenient path for the transfer of RF energy from one
circuit to another. The inductance and the distributed capacitance of some conductors can also support spurious
oscillations in the higher frequency ranges.
‘ Part number Type Dimensions (inches) Available materials
‘ ‘Al 'B' 'C’ 64 43 73 5B i
FB (--) 101 1 .138 ,051 .118 |x |
FB (--) 801 | 1 { 295 | ,084 |,297 | x |
FB (--)2d01 || 1 (380 | 197 190 T
FB(--)901 2 250 | ,050 |,417 | x |
| FB(--)5111 || 3 .236 | .038 | .394|‘ x |1
| Complete the part number with material designation in space provided (--) |
*Note: 'C' dimension for the FB-75B-101 Ferrite Bead, .128-inches, |
e —
TYPE 1 TYPE 2
Ferrite-Beads offer little, or no impedance to the lower frequencies and DC. At higher frequencies the
impedance will increase appreciably and will tend to reduce or dissipate the unwanted signals. Because the
Ferrite-Bead operates as a bulk device, it cannot be detuned by stray capacitance and it does not have to be
grounded. It can easily be added to any electronic circuit simply by slipping it over the conductor or component
lead suspected of carrying the troublesome interference.
The point at which attenuation becomes effective will depend upon the choice of bead-material. As shown in
the material-comparison-chart, the #64 material will offer the greatest impedance above 200 MHz. The #43
material is the most effective between 50 and 200 MHz. and the # 73 material is recommended for 50 MHz. and
below. The FB-75B-101 Ferrite Bead will offer greatest attenuation at about 10 MHz. The attenuation above 500
MHz. becomes relatively flat for all materials, although the DB level may be different for various materials.
MATERIAL COMPARISON CHART MAGNETIC PROPERTIES CHART
FERRITE - BEADS - .
| . Property Unit 73 Material 43 Matenal
This chart is intended ONLY for i T
comparison of bead materials. i | Initial permeability
: Impl"ndance (ohn?s)
—_—
: ive of the ) | Maximum permeabiiity
-|
Curves are representat Saturation flux density
smaller size beads —
@13 oer
-
Residual flux density
Curie temperature N "‘;
Volume resistivity
Specific gravity 1
Loss | 1 16x 105
factor | uoQ @ .06 MHz
+ o
73 material Coercive force | Oersteds
- NN - f — f Temp. Coeff. of
43 material ! initial permeability | %/DegC
Frequencies of |
Maximum impedance
A variety of types and sizes of Ferrite-Beads are in supply. The most popular being the ‘101" type. which will
fit picely over a #18 AWG conductor, and the ‘801" type, which will accept a #12 AWG wire. The FB-43-2401 is
another Ferrite-Bead product which is widely used in the construction of ‘ferrite-loaded’ transformers, such as
those found in the TRW-100 and the TRW-320 solid state power amplifiers. We also supply the 2-hole Ferrite-Bead
and the 6-hole Ferrite-Bead, which are excellent little devices for wide-band chokes, baluns and transformers.
Jel. GUNN PTY LTD
°
50 BRISBANE St. LAUNCESTON
o a-&“
Telephone 319333
DOMESTIC & BUILDERS HARDWARE
MARINE & PLUMBING SUPPLIES
PAINT & TOOLS
SEDDON PRESS
35a GRANVILLE St. LAUNCESTON 7250
Telephone 316191
¢
FOR ALL YOUR PRINTING
BUSINESS AND PERSONAL
QSL CARDS
DH& LS Chillcoft & Sons
ALL CLASSES ELECTRICAL INSTALLATIONS AND REPAIRS
INDUSTRIAL AND DOMESTIC MAINTENANCE
SALES AND SERVICE OF ELECTRICAL APPLIANCES
89 OLIVE St., NEWSTEAD, PHONE 311677
AFTER HOURS 444434 or 318659
Athol Lawes Electrics
135 HOBART Rd., KINGS MEADOWS, PHONE 444710
FOR ALL ELECTRICAL APPLIANCES, SPECIALISTS IN,
p w
HI-FI SOUND SYSTEMS
CAR RADIO AND STEREO
SEE US FOR A BETTER DEAL, WE SERVICE ALL WE SELL.